Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity and Stock Compensation - Summary of Assumptions Used In Determining Fair Value of Stock Options and Warrants (Details)

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Stockholders' Equity and Stock Compensation - Summary of Assumptions Used In Determining Fair Value of Stock Options and Warrants (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stockholders' Equity [Line Items]      
Expected option or Warrant life   0 years 3 years
Weighted average risk free rate   0.88%
Dividend yield 0.00% 0.00%
Expected volatility   26.42%
Minimum [Member]      
Stockholders' Equity [Line Items]      
Expected option or Warrant life 4 years 6 months    
Weighted average risk free rate 1.62%    
Expected volatility 38.59%    
Maximum [Member]      
Stockholders' Equity [Line Items]      
Expected option or Warrant life 4 years 9 months    
Weighted average risk free rate 1.81%    
Expected volatility 44.51%